我获取到本地的图片然后怎么获取图片的base64

Creator 2.x
#1 
    let fileData = jsb.fileUtils.getDataFromFile(filePath);

    let fileStr = jsb.fileUtils.getStringFromFile(filePath);

如上我一直本地缓存一张图片的地址然后我怎么获取这张图片的base64

#2

我之前是调用一个线上转换的接口

#3

我找到了个

ImageToBase64 (bytes) {
let base64 = ‘’;
let encodings = ‘ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/’;
let byteLength = bytes.byteLength;
let byteRemainder = byteLength % 3;
let mainLength = byteLength - byteRemainder;
var a, b, c, d;
var chunk;
// Main loop deals with bytes in chunks of 3
for (var i = 0; i < mainLength; i = i + 3) {
// Combine the three bytes into a single integer
chunk = (bytes[i] << 16) | (bytes[i + 1] << 8) | bytes[i + 2];
// Use bitmasks to extract 6-bit segments from the triplet
a = (chunk & 16515072) >> 18; // 16515072 = (2^6 - 1) << 18
b = (chunk & 258048) >> 12; // 258048 = (2^6 - 1) << 12
c = (chunk & 4032) >> 6; // 4032 = (2^6 - 1) << 6
d = chunk & 63; // 63 = 2^6 - 1
// Convert the raw binary segments to the appropriate ASCII encoding
base64 += encodings[a] + encodings[b] + encodings[c] + encodings[d];
}
// Deal with the remaining bytes and padding
if (byteRemainder == 1) {
chunk = bytes[mainLength];
a = (chunk & 252) >> 2; // 252 = (2^6 - 1) << 2;
// Set the 4 least significant bits to zero
b = (chunk & 3) << 4; // 3 = 2^2 - 1;
base64 += encodings[a] + encodings[b] + ‘==’;
} else if (byteRemainder == 2) {
chunk = (bytes[mainLength] << 8) | bytes[mainLength + 1];
a = (chunk & 16128) >> 8; // 16128 = (2^6 - 1) << 8;
b = (chunk & 1008) >> 4; // 1008 = (2^6 - 1) << 4;
// Set the 2 least significant bits to zero
c = (chunk & 15) << 2; // 15 = 2^4 - 1;
base64 += encodings[a] + encodings[b] + encodings[c] + ‘=’;
}
return ‘data:image/png;base64,’ + base64;
},

#4

这样也可以的

#5

大佬 你的这个方法 ImageToBase64 (bytes) 传的 bytes 是什么啊